def no_teen_sum(a, b, c):
  if a == 13or a == 14 or a == 17 or a == 18 or a == 19 :
    a = 0
  if b == 13 or b == 14 or b == 17 or b ==18  or b == 19 :
    b = 0
  if c == 14 or c == 17or c == 18 or c == 19 or  c == 13 :
    c = 0
  return(a+b+c)
   
